mirror of
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a3e403161f
Following warnings are generated when compiled with W=1,
drivers/dma/owl-dma.c:170: warning: Function parameter or member 'cyclic'
not described in 'owl_dma_txd'
drivers/dma/owl-dma.c:198: warning: Function parameter or member 'cfg' not
described in 'owl_dma_vchan'
drivers/dma/owl-dma.c:198: warning: Function parameter or member 'drq' not
described in 'owl_dma_vchan'
drivers/dma/owl-dma.c:225: warning: Function parameter or member 'irq' not
described in 'owl_dma'
Fix this by adding comments for relevant struct members to appear in
kernel-doc.
Fixes: d64e1b3f5c
("dmaengine: owl: Add Slave and Cyclic mode support for
Actions Semi Owl S900 SoC")
Reported-by: Vinod Koul <vinod.koul@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
1241 lines
30 KiB
C
1241 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// Actions Semi Owl SoCs DMA driver
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//
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// Copyright (c) 2014 Actions Semi Inc.
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// Author: David Liu <liuwei@actions-semi.com>
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//
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// Copyright (c) 2018 Linaro Ltd.
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// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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#include <linux/bitops.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmapool.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/of_dma.h>
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#include <linux/slab.h>
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#include "virt-dma.h"
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#define OWL_DMA_FRAME_MAX_LENGTH 0xfffff
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/* Global DMA Controller Registers */
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#define OWL_DMA_IRQ_PD0 0x00
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#define OWL_DMA_IRQ_PD1 0x04
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#define OWL_DMA_IRQ_PD2 0x08
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#define OWL_DMA_IRQ_PD3 0x0C
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#define OWL_DMA_IRQ_EN0 0x10
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#define OWL_DMA_IRQ_EN1 0x14
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#define OWL_DMA_IRQ_EN2 0x18
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#define OWL_DMA_IRQ_EN3 0x1C
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#define OWL_DMA_SECURE_ACCESS_CTL 0x20
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#define OWL_DMA_NIC_QOS 0x24
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#define OWL_DMA_DBGSEL 0x28
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#define OWL_DMA_IDLE_STAT 0x2C
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/* Channel Registers */
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#define OWL_DMA_CHAN_BASE(i) (0x100 + (i) * 0x100)
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#define OWL_DMAX_MODE 0x00
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#define OWL_DMAX_SOURCE 0x04
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#define OWL_DMAX_DESTINATION 0x08
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#define OWL_DMAX_FRAME_LEN 0x0C
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#define OWL_DMAX_FRAME_CNT 0x10
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#define OWL_DMAX_REMAIN_FRAME_CNT 0x14
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#define OWL_DMAX_REMAIN_CNT 0x18
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#define OWL_DMAX_SOURCE_STRIDE 0x1C
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#define OWL_DMAX_DESTINATION_STRIDE 0x20
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#define OWL_DMAX_START 0x24
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#define OWL_DMAX_PAUSE 0x28
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#define OWL_DMAX_CHAINED_CTL 0x2C
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#define OWL_DMAX_CONSTANT 0x30
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#define OWL_DMAX_LINKLIST_CTL 0x34
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#define OWL_DMAX_NEXT_DESCRIPTOR 0x38
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#define OWL_DMAX_CURRENT_DESCRIPTOR_NUM 0x3C
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#define OWL_DMAX_INT_CTL 0x40
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#define OWL_DMAX_INT_STATUS 0x44
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#define OWL_DMAX_CURRENT_SOURCE_POINTER 0x48
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#define OWL_DMAX_CURRENT_DESTINATION_POINTER 0x4C
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/* OWL_DMAX_MODE Bits */
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#define OWL_DMA_MODE_TS(x) (((x) & GENMASK(5, 0)) << 0)
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#define OWL_DMA_MODE_ST(x) (((x) & GENMASK(1, 0)) << 8)
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#define OWL_DMA_MODE_ST_DEV OWL_DMA_MODE_ST(0)
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#define OWL_DMA_MODE_ST_DCU OWL_DMA_MODE_ST(2)
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#define OWL_DMA_MODE_ST_SRAM OWL_DMA_MODE_ST(3)
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#define OWL_DMA_MODE_DT(x) (((x) & GENMASK(1, 0)) << 10)
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#define OWL_DMA_MODE_DT_DEV OWL_DMA_MODE_DT(0)
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#define OWL_DMA_MODE_DT_DCU OWL_DMA_MODE_DT(2)
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#define OWL_DMA_MODE_DT_SRAM OWL_DMA_MODE_DT(3)
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#define OWL_DMA_MODE_SAM(x) (((x) & GENMASK(1, 0)) << 16)
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#define OWL_DMA_MODE_SAM_CONST OWL_DMA_MODE_SAM(0)
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#define OWL_DMA_MODE_SAM_INC OWL_DMA_MODE_SAM(1)
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#define OWL_DMA_MODE_SAM_STRIDE OWL_DMA_MODE_SAM(2)
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#define OWL_DMA_MODE_DAM(x) (((x) & GENMASK(1, 0)) << 18)
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#define OWL_DMA_MODE_DAM_CONST OWL_DMA_MODE_DAM(0)
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#define OWL_DMA_MODE_DAM_INC OWL_DMA_MODE_DAM(1)
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#define OWL_DMA_MODE_DAM_STRIDE OWL_DMA_MODE_DAM(2)
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#define OWL_DMA_MODE_PW(x) (((x) & GENMASK(2, 0)) << 20)
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#define OWL_DMA_MODE_CB BIT(23)
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#define OWL_DMA_MODE_NDDBW(x) (((x) & 0x1) << 28)
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#define OWL_DMA_MODE_NDDBW_32BIT OWL_DMA_MODE_NDDBW(0)
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#define OWL_DMA_MODE_NDDBW_8BIT OWL_DMA_MODE_NDDBW(1)
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#define OWL_DMA_MODE_CFE BIT(29)
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#define OWL_DMA_MODE_LME BIT(30)
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#define OWL_DMA_MODE_CME BIT(31)
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/* OWL_DMAX_LINKLIST_CTL Bits */
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#define OWL_DMA_LLC_SAV(x) (((x) & GENMASK(1, 0)) << 8)
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#define OWL_DMA_LLC_SAV_INC OWL_DMA_LLC_SAV(0)
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#define OWL_DMA_LLC_SAV_LOAD_NEXT OWL_DMA_LLC_SAV(1)
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#define OWL_DMA_LLC_SAV_LOAD_PREV OWL_DMA_LLC_SAV(2)
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#define OWL_DMA_LLC_DAV(x) (((x) & GENMASK(1, 0)) << 10)
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#define OWL_DMA_LLC_DAV_INC OWL_DMA_LLC_DAV(0)
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#define OWL_DMA_LLC_DAV_LOAD_NEXT OWL_DMA_LLC_DAV(1)
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#define OWL_DMA_LLC_DAV_LOAD_PREV OWL_DMA_LLC_DAV(2)
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#define OWL_DMA_LLC_SUSPEND BIT(16)
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/* OWL_DMAX_INT_CTL Bits */
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#define OWL_DMA_INTCTL_BLOCK BIT(0)
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#define OWL_DMA_INTCTL_SUPER_BLOCK BIT(1)
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#define OWL_DMA_INTCTL_FRAME BIT(2)
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#define OWL_DMA_INTCTL_HALF_FRAME BIT(3)
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#define OWL_DMA_INTCTL_LAST_FRAME BIT(4)
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/* OWL_DMAX_INT_STATUS Bits */
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#define OWL_DMA_INTSTAT_BLOCK BIT(0)
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#define OWL_DMA_INTSTAT_SUPER_BLOCK BIT(1)
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#define OWL_DMA_INTSTAT_FRAME BIT(2)
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#define OWL_DMA_INTSTAT_HALF_FRAME BIT(3)
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#define OWL_DMA_INTSTAT_LAST_FRAME BIT(4)
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/* Pack shift and newshift in a single word */
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#define BIT_FIELD(val, width, shift, newshift) \
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((((val) >> (shift)) & ((BIT(width)) - 1)) << (newshift))
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/**
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* struct owl_dma_lli_hw - Hardware link list for dma transfer
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* @next_lli: physical address of the next link list
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* @saddr: source physical address
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* @daddr: destination physical address
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* @flen: frame length
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* @fcnt: frame count
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* @src_stride: source stride
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* @dst_stride: destination stride
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* @ctrla: dma_mode and linklist ctrl config
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* @ctrlb: interrupt config
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* @const_num: data for constant fill
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*/
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struct owl_dma_lli_hw {
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u32 next_lli;
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u32 saddr;
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u32 daddr;
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u32 flen:20;
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u32 fcnt:12;
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u32 src_stride;
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u32 dst_stride;
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u32 ctrla;
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u32 ctrlb;
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u32 const_num;
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};
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/**
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* struct owl_dma_lli - Link list for dma transfer
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* @hw: hardware link list
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* @phys: physical address of hardware link list
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* @node: node for txd's lli_list
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*/
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struct owl_dma_lli {
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struct owl_dma_lli_hw hw;
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dma_addr_t phys;
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struct list_head node;
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};
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/**
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* struct owl_dma_txd - Wrapper for struct dma_async_tx_descriptor
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* @vd: virtual DMA descriptor
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* @lli_list: link list of lli nodes
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* @cyclic: flag to indicate cyclic transfers
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*/
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struct owl_dma_txd {
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struct virt_dma_desc vd;
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struct list_head lli_list;
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bool cyclic;
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};
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/**
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* struct owl_dma_pchan - Holder for the physical channels
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* @id: physical index to this channel
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* @base: virtual memory base for the dma channel
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* @vchan: the virtual channel currently being served by this physical channel
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* @lock: a lock to use when altering an instance of this struct
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*/
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struct owl_dma_pchan {
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u32 id;
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void __iomem *base;
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struct owl_dma_vchan *vchan;
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spinlock_t lock;
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};
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/**
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* struct owl_dma_pchan - Wrapper for DMA ENGINE channel
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* @vc: wrappped virtual channel
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* @pchan: the physical channel utilized by this channel
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* @txd: active transaction on this channel
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* @cfg: slave configuration for this channel
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* @drq: physical DMA request ID for this channel
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*/
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struct owl_dma_vchan {
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struct virt_dma_chan vc;
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struct owl_dma_pchan *pchan;
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struct owl_dma_txd *txd;
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struct dma_slave_config cfg;
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u8 drq;
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};
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/**
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* struct owl_dma - Holder for the Owl DMA controller
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* @dma: dma engine for this instance
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* @base: virtual memory base for the DMA controller
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* @clk: clock for the DMA controller
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* @lock: a lock to use when change DMA controller global register
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* @lli_pool: a pool for the LLI descriptors
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* @irq: interrupt ID for the DMA controller
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* @nr_pchans: the number of physical channels
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* @pchans: array of data for the physical channels
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* @nr_vchans: the number of physical channels
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* @vchans: array of data for the physical channels
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*/
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struct owl_dma {
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struct dma_device dma;
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void __iomem *base;
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struct clk *clk;
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spinlock_t lock;
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struct dma_pool *lli_pool;
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int irq;
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unsigned int nr_pchans;
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struct owl_dma_pchan *pchans;
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unsigned int nr_vchans;
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struct owl_dma_vchan *vchans;
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};
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static void pchan_update(struct owl_dma_pchan *pchan, u32 reg,
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u32 val, bool state)
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{
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u32 regval;
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regval = readl(pchan->base + reg);
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if (state)
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regval |= val;
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else
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regval &= ~val;
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writel(val, pchan->base + reg);
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}
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static void pchan_writel(struct owl_dma_pchan *pchan, u32 reg, u32 data)
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{
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writel(data, pchan->base + reg);
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}
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static u32 pchan_readl(struct owl_dma_pchan *pchan, u32 reg)
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{
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return readl(pchan->base + reg);
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}
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static void dma_update(struct owl_dma *od, u32 reg, u32 val, bool state)
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{
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u32 regval;
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regval = readl(od->base + reg);
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if (state)
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regval |= val;
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else
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regval &= ~val;
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writel(val, od->base + reg);
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}
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static void dma_writel(struct owl_dma *od, u32 reg, u32 data)
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{
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writel(data, od->base + reg);
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}
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static u32 dma_readl(struct owl_dma *od, u32 reg)
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{
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return readl(od->base + reg);
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}
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static inline struct owl_dma *to_owl_dma(struct dma_device *dd)
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{
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return container_of(dd, struct owl_dma, dma);
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}
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static struct device *chan2dev(struct dma_chan *chan)
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{
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return &chan->dev->device;
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}
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static inline struct owl_dma_vchan *to_owl_vchan(struct dma_chan *chan)
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{
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return container_of(chan, struct owl_dma_vchan, vc.chan);
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}
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static inline struct owl_dma_txd *to_owl_txd(struct dma_async_tx_descriptor *tx)
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{
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return container_of(tx, struct owl_dma_txd, vd.tx);
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}
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static inline u32 llc_hw_ctrla(u32 mode, u32 llc_ctl)
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{
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u32 ctl;
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ctl = BIT_FIELD(mode, 4, 28, 28) |
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BIT_FIELD(mode, 8, 16, 20) |
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BIT_FIELD(mode, 4, 8, 16) |
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BIT_FIELD(mode, 6, 0, 10) |
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BIT_FIELD(llc_ctl, 2, 10, 8) |
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BIT_FIELD(llc_ctl, 2, 8, 6);
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return ctl;
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}
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static inline u32 llc_hw_ctrlb(u32 int_ctl)
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{
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u32 ctl;
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ctl = BIT_FIELD(int_ctl, 7, 0, 18);
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return ctl;
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}
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static void owl_dma_free_lli(struct owl_dma *od,
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struct owl_dma_lli *lli)
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{
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list_del(&lli->node);
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dma_pool_free(od->lli_pool, lli, lli->phys);
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}
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static struct owl_dma_lli *owl_dma_alloc_lli(struct owl_dma *od)
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{
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struct owl_dma_lli *lli;
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dma_addr_t phys;
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lli = dma_pool_alloc(od->lli_pool, GFP_NOWAIT, &phys);
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if (!lli)
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return NULL;
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INIT_LIST_HEAD(&lli->node);
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lli->phys = phys;
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return lli;
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}
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static struct owl_dma_lli *owl_dma_add_lli(struct owl_dma_txd *txd,
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struct owl_dma_lli *prev,
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struct owl_dma_lli *next,
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bool is_cyclic)
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{
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if (!is_cyclic)
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list_add_tail(&next->node, &txd->lli_list);
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if (prev) {
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prev->hw.next_lli = next->phys;
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prev->hw.ctrla |= llc_hw_ctrla(OWL_DMA_MODE_LME, 0);
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}
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return next;
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}
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static inline int owl_dma_cfg_lli(struct owl_dma_vchan *vchan,
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struct owl_dma_lli *lli,
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dma_addr_t src, dma_addr_t dst,
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u32 len, enum dma_transfer_direction dir,
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struct dma_slave_config *sconfig,
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bool is_cyclic)
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{
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struct owl_dma_lli_hw *hw = &lli->hw;
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u32 mode;
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mode = OWL_DMA_MODE_PW(0);
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switch (dir) {
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case DMA_MEM_TO_MEM:
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mode |= OWL_DMA_MODE_TS(0) | OWL_DMA_MODE_ST_DCU |
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OWL_DMA_MODE_DT_DCU | OWL_DMA_MODE_SAM_INC |
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OWL_DMA_MODE_DAM_INC;
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break;
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case DMA_MEM_TO_DEV:
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mode |= OWL_DMA_MODE_TS(vchan->drq)
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| OWL_DMA_MODE_ST_DCU | OWL_DMA_MODE_DT_DEV
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| OWL_DMA_MODE_SAM_INC | OWL_DMA_MODE_DAM_CONST;
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/*
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* Hardware only supports 32bit and 8bit buswidth. Since the
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* default is 32bit, select 8bit only when requested.
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*/
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if (sconfig->dst_addr_width == DMA_SLAVE_BUSWIDTH_1_BYTE)
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mode |= OWL_DMA_MODE_NDDBW_8BIT;
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break;
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case DMA_DEV_TO_MEM:
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mode |= OWL_DMA_MODE_TS(vchan->drq)
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| OWL_DMA_MODE_ST_DEV | OWL_DMA_MODE_DT_DCU
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| OWL_DMA_MODE_SAM_CONST | OWL_DMA_MODE_DAM_INC;
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/*
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* Hardware only supports 32bit and 8bit buswidth. Since the
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* default is 32bit, select 8bit only when requested.
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*/
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if (sconfig->src_addr_width == DMA_SLAVE_BUSWIDTH_1_BYTE)
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mode |= OWL_DMA_MODE_NDDBW_8BIT;
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break;
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default:
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return -EINVAL;
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}
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hw->next_lli = 0; /* One link list by default */
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hw->saddr = src;
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hw->daddr = dst;
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hw->fcnt = 1; /* Frame count fixed as 1 */
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hw->flen = len; /* Max frame length is 1MB */
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hw->src_stride = 0;
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hw->dst_stride = 0;
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hw->ctrla = llc_hw_ctrla(mode,
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OWL_DMA_LLC_SAV_LOAD_NEXT |
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OWL_DMA_LLC_DAV_LOAD_NEXT);
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if (is_cyclic)
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hw->ctrlb = llc_hw_ctrlb(OWL_DMA_INTCTL_BLOCK);
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else
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hw->ctrlb = llc_hw_ctrlb(OWL_DMA_INTCTL_SUPER_BLOCK);
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return 0;
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}
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static struct owl_dma_pchan *owl_dma_get_pchan(struct owl_dma *od,
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struct owl_dma_vchan *vchan)
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{
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struct owl_dma_pchan *pchan = NULL;
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unsigned long flags;
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int i;
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for (i = 0; i < od->nr_pchans; i++) {
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pchan = &od->pchans[i];
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spin_lock_irqsave(&pchan->lock, flags);
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if (!pchan->vchan) {
|
|
pchan->vchan = vchan;
|
|
spin_unlock_irqrestore(&pchan->lock, flags);
|
|
break;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&pchan->lock, flags);
|
|
}
|
|
|
|
return pchan;
|
|
}
|
|
|
|
static int owl_dma_pchan_busy(struct owl_dma *od, struct owl_dma_pchan *pchan)
|
|
{
|
|
unsigned int val;
|
|
|
|
val = dma_readl(od, OWL_DMA_IDLE_STAT);
|
|
|
|
return !(val & (1 << pchan->id));
|
|
}
|
|
|
|
static void owl_dma_terminate_pchan(struct owl_dma *od,
|
|
struct owl_dma_pchan *pchan)
|
|
{
|
|
unsigned long flags;
|
|
u32 irq_pd;
|
|
|
|
pchan_writel(pchan, OWL_DMAX_START, 0);
|
|
pchan_update(pchan, OWL_DMAX_INT_STATUS, 0xff, false);
|
|
|
|
spin_lock_irqsave(&od->lock, flags);
|
|
dma_update(od, OWL_DMA_IRQ_EN0, (1 << pchan->id), false);
|
|
|
|
irq_pd = dma_readl(od, OWL_DMA_IRQ_PD0);
|
|
if (irq_pd & (1 << pchan->id)) {
|
|
dev_warn(od->dma.dev,
|
|
"terminating pchan %d that still has pending irq\n",
|
|
pchan->id);
|
|
dma_writel(od, OWL_DMA_IRQ_PD0, (1 << pchan->id));
|
|
}
|
|
|
|
pchan->vchan = NULL;
|
|
|
|
spin_unlock_irqrestore(&od->lock, flags);
|
|
}
|
|
|
|
static void owl_dma_pause_pchan(struct owl_dma_pchan *pchan)
|
|
{
|
|
pchan_writel(pchan, 1, OWL_DMAX_PAUSE);
|
|
}
|
|
|
|
static void owl_dma_resume_pchan(struct owl_dma_pchan *pchan)
|
|
{
|
|
pchan_writel(pchan, 0, OWL_DMAX_PAUSE);
|
|
}
|
|
|
|
static int owl_dma_start_next_txd(struct owl_dma_vchan *vchan)
|
|
{
|
|
struct owl_dma *od = to_owl_dma(vchan->vc.chan.device);
|
|
struct virt_dma_desc *vd = vchan_next_desc(&vchan->vc);
|
|
struct owl_dma_pchan *pchan = vchan->pchan;
|
|
struct owl_dma_txd *txd = to_owl_txd(&vd->tx);
|
|
struct owl_dma_lli *lli;
|
|
unsigned long flags;
|
|
u32 int_ctl;
|
|
|
|
list_del(&vd->node);
|
|
|
|
vchan->txd = txd;
|
|
|
|
/* Wait for channel inactive */
|
|
while (owl_dma_pchan_busy(od, pchan))
|
|
cpu_relax();
|
|
|
|
lli = list_first_entry(&txd->lli_list,
|
|
struct owl_dma_lli, node);
|
|
|
|
if (txd->cyclic)
|
|
int_ctl = OWL_DMA_INTCTL_BLOCK;
|
|
else
|
|
int_ctl = OWL_DMA_INTCTL_SUPER_BLOCK;
|
|
|
|
pchan_writel(pchan, OWL_DMAX_MODE, OWL_DMA_MODE_LME);
|
|
pchan_writel(pchan, OWL_DMAX_LINKLIST_CTL,
|
|
OWL_DMA_LLC_SAV_LOAD_NEXT | OWL_DMA_LLC_DAV_LOAD_NEXT);
|
|
pchan_writel(pchan, OWL_DMAX_NEXT_DESCRIPTOR, lli->phys);
|
|
pchan_writel(pchan, OWL_DMAX_INT_CTL, int_ctl);
|
|
|
|
/* Clear IRQ status for this pchan */
|
|
pchan_update(pchan, OWL_DMAX_INT_STATUS, 0xff, false);
|
|
|
|
spin_lock_irqsave(&od->lock, flags);
|
|
|
|
dma_update(od, OWL_DMA_IRQ_EN0, (1 << pchan->id), true);
|
|
|
|
spin_unlock_irqrestore(&od->lock, flags);
|
|
|
|
dev_dbg(chan2dev(&vchan->vc.chan), "starting pchan %d\n", pchan->id);
|
|
|
|
/* Start DMA transfer for this pchan */
|
|
pchan_writel(pchan, OWL_DMAX_START, 0x1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void owl_dma_phy_free(struct owl_dma *od, struct owl_dma_vchan *vchan)
|
|
{
|
|
/* Ensure that the physical channel is stopped */
|
|
owl_dma_terminate_pchan(od, vchan->pchan);
|
|
|
|
vchan->pchan = NULL;
|
|
}
|
|
|
|
static irqreturn_t owl_dma_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct owl_dma *od = dev_id;
|
|
struct owl_dma_vchan *vchan;
|
|
struct owl_dma_pchan *pchan;
|
|
unsigned long pending;
|
|
int i;
|
|
unsigned int global_irq_pending, chan_irq_pending;
|
|
|
|
spin_lock(&od->lock);
|
|
|
|
pending = dma_readl(od, OWL_DMA_IRQ_PD0);
|
|
|
|
/* Clear IRQ status for each pchan */
|
|
for_each_set_bit(i, &pending, od->nr_pchans) {
|
|
pchan = &od->pchans[i];
|
|
pchan_update(pchan, OWL_DMAX_INT_STATUS, 0xff, false);
|
|
}
|
|
|
|
/* Clear pending IRQ */
|
|
dma_writel(od, OWL_DMA_IRQ_PD0, pending);
|
|
|
|
/* Check missed pending IRQ */
|
|
for (i = 0; i < od->nr_pchans; i++) {
|
|
pchan = &od->pchans[i];
|
|
chan_irq_pending = pchan_readl(pchan, OWL_DMAX_INT_CTL) &
|
|
pchan_readl(pchan, OWL_DMAX_INT_STATUS);
|
|
|
|
/* Dummy read to ensure OWL_DMA_IRQ_PD0 value is updated */
|
|
dma_readl(od, OWL_DMA_IRQ_PD0);
|
|
|
|
global_irq_pending = dma_readl(od, OWL_DMA_IRQ_PD0);
|
|
|
|
if (chan_irq_pending && !(global_irq_pending & BIT(i))) {
|
|
dev_dbg(od->dma.dev,
|
|
"global and channel IRQ pending match err\n");
|
|
|
|
/* Clear IRQ status for this pchan */
|
|
pchan_update(pchan, OWL_DMAX_INT_STATUS,
|
|
0xff, false);
|
|
|
|
/* Update global IRQ pending */
|
|
pending |= BIT(i);
|
|
}
|
|
}
|
|
|
|
spin_unlock(&od->lock);
|
|
|
|
for_each_set_bit(i, &pending, od->nr_pchans) {
|
|
struct owl_dma_txd *txd;
|
|
|
|
pchan = &od->pchans[i];
|
|
|
|
vchan = pchan->vchan;
|
|
if (!vchan) {
|
|
dev_warn(od->dma.dev, "no vchan attached on pchan %d\n",
|
|
pchan->id);
|
|
continue;
|
|
}
|
|
|
|
spin_lock(&vchan->vc.lock);
|
|
|
|
txd = vchan->txd;
|
|
if (txd) {
|
|
vchan->txd = NULL;
|
|
|
|
vchan_cookie_complete(&txd->vd);
|
|
|
|
/*
|
|
* Start the next descriptor (if any),
|
|
* otherwise free this channel.
|
|
*/
|
|
if (vchan_next_desc(&vchan->vc))
|
|
owl_dma_start_next_txd(vchan);
|
|
else
|
|
owl_dma_phy_free(od, vchan);
|
|
}
|
|
|
|
spin_unlock(&vchan->vc.lock);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void owl_dma_free_txd(struct owl_dma *od, struct owl_dma_txd *txd)
|
|
{
|
|
struct owl_dma_lli *lli, *_lli;
|
|
|
|
if (unlikely(!txd))
|
|
return;
|
|
|
|
list_for_each_entry_safe(lli, _lli, &txd->lli_list, node)
|
|
owl_dma_free_lli(od, lli);
|
|
|
|
kfree(txd);
|
|
}
|
|
|
|
static void owl_dma_desc_free(struct virt_dma_desc *vd)
|
|
{
|
|
struct owl_dma *od = to_owl_dma(vd->tx.chan->device);
|
|
struct owl_dma_txd *txd = to_owl_txd(&vd->tx);
|
|
|
|
owl_dma_free_txd(od, txd);
|
|
}
|
|
|
|
static int owl_dma_terminate_all(struct dma_chan *chan)
|
|
{
|
|
struct owl_dma *od = to_owl_dma(chan->device);
|
|
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
|
|
unsigned long flags;
|
|
LIST_HEAD(head);
|
|
|
|
spin_lock_irqsave(&vchan->vc.lock, flags);
|
|
|
|
if (vchan->pchan)
|
|
owl_dma_phy_free(od, vchan);
|
|
|
|
if (vchan->txd) {
|
|
owl_dma_desc_free(&vchan->txd->vd);
|
|
vchan->txd = NULL;
|
|
}
|
|
|
|
vchan_get_all_descriptors(&vchan->vc, &head);
|
|
vchan_dma_desc_free_list(&vchan->vc, &head);
|
|
|
|
spin_unlock_irqrestore(&vchan->vc.lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int owl_dma_config(struct dma_chan *chan,
|
|
struct dma_slave_config *config)
|
|
{
|
|
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
|
|
|
|
/* Reject definitely invalid configurations */
|
|
if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
|
|
config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
|
|
return -EINVAL;
|
|
|
|
memcpy(&vchan->cfg, config, sizeof(struct dma_slave_config));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int owl_dma_pause(struct dma_chan *chan)
|
|
{
|
|
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&vchan->vc.lock, flags);
|
|
|
|
owl_dma_pause_pchan(vchan->pchan);
|
|
|
|
spin_unlock_irqrestore(&vchan->vc.lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int owl_dma_resume(struct dma_chan *chan)
|
|
{
|
|
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
|
|
unsigned long flags;
|
|
|
|
if (!vchan->pchan && !vchan->txd)
|
|
return 0;
|
|
|
|
dev_dbg(chan2dev(chan), "vchan %p: resume\n", &vchan->vc);
|
|
|
|
spin_lock_irqsave(&vchan->vc.lock, flags);
|
|
|
|
owl_dma_resume_pchan(vchan->pchan);
|
|
|
|
spin_unlock_irqrestore(&vchan->vc.lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u32 owl_dma_getbytes_chan(struct owl_dma_vchan *vchan)
|
|
{
|
|
struct owl_dma_pchan *pchan;
|
|
struct owl_dma_txd *txd;
|
|
struct owl_dma_lli *lli;
|
|
unsigned int next_lli_phy;
|
|
size_t bytes;
|
|
|
|
pchan = vchan->pchan;
|
|
txd = vchan->txd;
|
|
|
|
if (!pchan || !txd)
|
|
return 0;
|
|
|
|
/* Get remain count of current node in link list */
|
|
bytes = pchan_readl(pchan, OWL_DMAX_REMAIN_CNT);
|
|
|
|
/* Loop through the preceding nodes to get total remaining bytes */
|
|
if (pchan_readl(pchan, OWL_DMAX_MODE) & OWL_DMA_MODE_LME) {
|
|
next_lli_phy = pchan_readl(pchan, OWL_DMAX_NEXT_DESCRIPTOR);
|
|
list_for_each_entry(lli, &txd->lli_list, node) {
|
|
/* Start from the next active node */
|
|
if (lli->phys == next_lli_phy) {
|
|
list_for_each_entry(lli, &txd->lli_list, node)
|
|
bytes += lli->hw.flen;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return bytes;
|
|
}
|
|
|
|
static enum dma_status owl_dma_tx_status(struct dma_chan *chan,
|
|
dma_cookie_t cookie,
|
|
struct dma_tx_state *state)
|
|
{
|
|
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
|
|
struct owl_dma_lli *lli;
|
|
struct virt_dma_desc *vd;
|
|
struct owl_dma_txd *txd;
|
|
enum dma_status ret;
|
|
unsigned long flags;
|
|
size_t bytes = 0;
|
|
|
|
ret = dma_cookie_status(chan, cookie, state);
|
|
if (ret == DMA_COMPLETE || !state)
|
|
return ret;
|
|
|
|
spin_lock_irqsave(&vchan->vc.lock, flags);
|
|
|
|
vd = vchan_find_desc(&vchan->vc, cookie);
|
|
if (vd) {
|
|
txd = to_owl_txd(&vd->tx);
|
|
list_for_each_entry(lli, &txd->lli_list, node)
|
|
bytes += lli->hw.flen;
|
|
} else {
|
|
bytes = owl_dma_getbytes_chan(vchan);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&vchan->vc.lock, flags);
|
|
|
|
dma_set_residue(state, bytes);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void owl_dma_phy_alloc_and_start(struct owl_dma_vchan *vchan)
|
|
{
|
|
struct owl_dma *od = to_owl_dma(vchan->vc.chan.device);
|
|
struct owl_dma_pchan *pchan;
|
|
|
|
pchan = owl_dma_get_pchan(od, vchan);
|
|
if (!pchan)
|
|
return;
|
|
|
|
dev_dbg(od->dma.dev, "allocated pchan %d\n", pchan->id);
|
|
|
|
vchan->pchan = pchan;
|
|
owl_dma_start_next_txd(vchan);
|
|
}
|
|
|
|
static void owl_dma_issue_pending(struct dma_chan *chan)
|
|
{
|
|
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&vchan->vc.lock, flags);
|
|
if (vchan_issue_pending(&vchan->vc)) {
|
|
if (!vchan->pchan)
|
|
owl_dma_phy_alloc_and_start(vchan);
|
|
}
|
|
spin_unlock_irqrestore(&vchan->vc.lock, flags);
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor
|
|
*owl_dma_prep_memcpy(struct dma_chan *chan,
|
|
dma_addr_t dst, dma_addr_t src,
|
|
size_t len, unsigned long flags)
|
|
{
|
|
struct owl_dma *od = to_owl_dma(chan->device);
|
|
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
|
|
struct owl_dma_txd *txd;
|
|
struct owl_dma_lli *lli, *prev = NULL;
|
|
size_t offset, bytes;
|
|
int ret;
|
|
|
|
if (!len)
|
|
return NULL;
|
|
|
|
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
|
|
if (!txd)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&txd->lli_list);
|
|
|
|
/* Process the transfer as frame by frame */
|
|
for (offset = 0; offset < len; offset += bytes) {
|
|
lli = owl_dma_alloc_lli(od);
|
|
if (!lli) {
|
|
dev_warn(chan2dev(chan), "failed to allocate lli\n");
|
|
goto err_txd_free;
|
|
}
|
|
|
|
bytes = min_t(size_t, (len - offset), OWL_DMA_FRAME_MAX_LENGTH);
|
|
|
|
ret = owl_dma_cfg_lli(vchan, lli, src + offset, dst + offset,
|
|
bytes, DMA_MEM_TO_MEM,
|
|
&vchan->cfg, txd->cyclic);
|
|
if (ret) {
|
|
dev_warn(chan2dev(chan), "failed to config lli\n");
|
|
goto err_txd_free;
|
|
}
|
|
|
|
prev = owl_dma_add_lli(txd, prev, lli, false);
|
|
}
|
|
|
|
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
|
|
|
|
err_txd_free:
|
|
owl_dma_free_txd(od, txd);
|
|
return NULL;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor
|
|
*owl_dma_prep_slave_sg(struct dma_chan *chan,
|
|
struct scatterlist *sgl,
|
|
unsigned int sg_len,
|
|
enum dma_transfer_direction dir,
|
|
unsigned long flags, void *context)
|
|
{
|
|
struct owl_dma *od = to_owl_dma(chan->device);
|
|
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
|
|
struct dma_slave_config *sconfig = &vchan->cfg;
|
|
struct owl_dma_txd *txd;
|
|
struct owl_dma_lli *lli, *prev = NULL;
|
|
struct scatterlist *sg;
|
|
dma_addr_t addr, src = 0, dst = 0;
|
|
size_t len;
|
|
int ret, i;
|
|
|
|
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
|
|
if (!txd)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&txd->lli_list);
|
|
|
|
for_each_sg(sgl, sg, sg_len, i) {
|
|
addr = sg_dma_address(sg);
|
|
len = sg_dma_len(sg);
|
|
|
|
if (len > OWL_DMA_FRAME_MAX_LENGTH) {
|
|
dev_err(od->dma.dev,
|
|
"frame length exceeds max supported length");
|
|
goto err_txd_free;
|
|
}
|
|
|
|
lli = owl_dma_alloc_lli(od);
|
|
if (!lli) {
|
|
dev_err(chan2dev(chan), "failed to allocate lli");
|
|
goto err_txd_free;
|
|
}
|
|
|
|
if (dir == DMA_MEM_TO_DEV) {
|
|
src = addr;
|
|
dst = sconfig->dst_addr;
|
|
} else {
|
|
src = sconfig->src_addr;
|
|
dst = addr;
|
|
}
|
|
|
|
ret = owl_dma_cfg_lli(vchan, lli, src, dst, len, dir, sconfig,
|
|
txd->cyclic);
|
|
if (ret) {
|
|
dev_warn(chan2dev(chan), "failed to config lli");
|
|
goto err_txd_free;
|
|
}
|
|
|
|
prev = owl_dma_add_lli(txd, prev, lli, false);
|
|
}
|
|
|
|
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
|
|
|
|
err_txd_free:
|
|
owl_dma_free_txd(od, txd);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor
|
|
*owl_prep_dma_cyclic(struct dma_chan *chan,
|
|
dma_addr_t buf_addr, size_t buf_len,
|
|
size_t period_len,
|
|
enum dma_transfer_direction dir,
|
|
unsigned long flags)
|
|
{
|
|
struct owl_dma *od = to_owl_dma(chan->device);
|
|
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
|
|
struct dma_slave_config *sconfig = &vchan->cfg;
|
|
struct owl_dma_txd *txd;
|
|
struct owl_dma_lli *lli, *prev = NULL, *first = NULL;
|
|
dma_addr_t src = 0, dst = 0;
|
|
unsigned int periods = buf_len / period_len;
|
|
int ret, i;
|
|
|
|
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
|
|
if (!txd)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&txd->lli_list);
|
|
txd->cyclic = true;
|
|
|
|
for (i = 0; i < periods; i++) {
|
|
lli = owl_dma_alloc_lli(od);
|
|
if (!lli) {
|
|
dev_warn(chan2dev(chan), "failed to allocate lli");
|
|
goto err_txd_free;
|
|
}
|
|
|
|
if (dir == DMA_MEM_TO_DEV) {
|
|
src = buf_addr + (period_len * i);
|
|
dst = sconfig->dst_addr;
|
|
} else if (dir == DMA_DEV_TO_MEM) {
|
|
src = sconfig->src_addr;
|
|
dst = buf_addr + (period_len * i);
|
|
}
|
|
|
|
ret = owl_dma_cfg_lli(vchan, lli, src, dst, period_len,
|
|
dir, sconfig, txd->cyclic);
|
|
if (ret) {
|
|
dev_warn(chan2dev(chan), "failed to config lli");
|
|
goto err_txd_free;
|
|
}
|
|
|
|
if (!first)
|
|
first = lli;
|
|
|
|
prev = owl_dma_add_lli(txd, prev, lli, false);
|
|
}
|
|
|
|
/* close the cyclic list */
|
|
owl_dma_add_lli(txd, prev, first, true);
|
|
|
|
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
|
|
|
|
err_txd_free:
|
|
owl_dma_free_txd(od, txd);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void owl_dma_free_chan_resources(struct dma_chan *chan)
|
|
{
|
|
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
|
|
|
|
/* Ensure all queued descriptors are freed */
|
|
vchan_free_chan_resources(&vchan->vc);
|
|
}
|
|
|
|
static inline void owl_dma_free(struct owl_dma *od)
|
|
{
|
|
struct owl_dma_vchan *vchan = NULL;
|
|
struct owl_dma_vchan *next;
|
|
|
|
list_for_each_entry_safe(vchan,
|
|
next, &od->dma.channels, vc.chan.device_node) {
|
|
list_del(&vchan->vc.chan.device_node);
|
|
tasklet_kill(&vchan->vc.task);
|
|
}
|
|
}
|
|
|
|
static struct dma_chan *owl_dma_of_xlate(struct of_phandle_args *dma_spec,
|
|
struct of_dma *ofdma)
|
|
{
|
|
struct owl_dma *od = ofdma->of_dma_data;
|
|
struct owl_dma_vchan *vchan;
|
|
struct dma_chan *chan;
|
|
u8 drq = dma_spec->args[0];
|
|
|
|
if (drq > od->nr_vchans)
|
|
return NULL;
|
|
|
|
chan = dma_get_any_slave_channel(&od->dma);
|
|
if (!chan)
|
|
return NULL;
|
|
|
|
vchan = to_owl_vchan(chan);
|
|
vchan->drq = drq;
|
|
|
|
return chan;
|
|
}
|
|
|
|
static int owl_dma_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct owl_dma *od;
|
|
struct resource *res;
|
|
int ret, i, nr_channels, nr_requests;
|
|
|
|
od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL);
|
|
if (!od)
|
|
return -ENOMEM;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -EINVAL;
|
|
|
|
od->base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(od->base))
|
|
return PTR_ERR(od->base);
|
|
|
|
ret = of_property_read_u32(np, "dma-channels", &nr_channels);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "can't get dma-channels\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = of_property_read_u32(np, "dma-requests", &nr_requests);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "can't get dma-requests\n");
|
|
return ret;
|
|
}
|
|
|
|
dev_info(&pdev->dev, "dma-channels %d, dma-requests %d\n",
|
|
nr_channels, nr_requests);
|
|
|
|
od->nr_pchans = nr_channels;
|
|
od->nr_vchans = nr_requests;
|
|
|
|
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
|
|
|
|
platform_set_drvdata(pdev, od);
|
|
spin_lock_init(&od->lock);
|
|
|
|
dma_cap_set(DMA_MEMCPY, od->dma.cap_mask);
|
|
dma_cap_set(DMA_SLAVE, od->dma.cap_mask);
|
|
dma_cap_set(DMA_CYCLIC, od->dma.cap_mask);
|
|
|
|
od->dma.dev = &pdev->dev;
|
|
od->dma.device_free_chan_resources = owl_dma_free_chan_resources;
|
|
od->dma.device_tx_status = owl_dma_tx_status;
|
|
od->dma.device_issue_pending = owl_dma_issue_pending;
|
|
od->dma.device_prep_dma_memcpy = owl_dma_prep_memcpy;
|
|
od->dma.device_prep_slave_sg = owl_dma_prep_slave_sg;
|
|
od->dma.device_prep_dma_cyclic = owl_prep_dma_cyclic;
|
|
od->dma.device_config = owl_dma_config;
|
|
od->dma.device_pause = owl_dma_pause;
|
|
od->dma.device_resume = owl_dma_resume;
|
|
od->dma.device_terminate_all = owl_dma_terminate_all;
|
|
od->dma.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
|
|
od->dma.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
|
|
od->dma.directions = BIT(DMA_MEM_TO_MEM);
|
|
od->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
|
|
|
|
INIT_LIST_HEAD(&od->dma.channels);
|
|
|
|
od->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(od->clk)) {
|
|
dev_err(&pdev->dev, "unable to get clock\n");
|
|
return PTR_ERR(od->clk);
|
|
}
|
|
|
|
/*
|
|
* Eventhough the DMA controller is capable of generating 4
|
|
* IRQ's for DMA priority feature, we only use 1 IRQ for
|
|
* simplification.
|
|
*/
|
|
od->irq = platform_get_irq(pdev, 0);
|
|
ret = devm_request_irq(&pdev->dev, od->irq, owl_dma_interrupt, 0,
|
|
dev_name(&pdev->dev), od);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "unable to request IRQ\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Init physical channel */
|
|
od->pchans = devm_kcalloc(&pdev->dev, od->nr_pchans,
|
|
sizeof(struct owl_dma_pchan), GFP_KERNEL);
|
|
if (!od->pchans)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < od->nr_pchans; i++) {
|
|
struct owl_dma_pchan *pchan = &od->pchans[i];
|
|
|
|
pchan->id = i;
|
|
pchan->base = od->base + OWL_DMA_CHAN_BASE(i);
|
|
}
|
|
|
|
/* Init virtual channel */
|
|
od->vchans = devm_kcalloc(&pdev->dev, od->nr_vchans,
|
|
sizeof(struct owl_dma_vchan), GFP_KERNEL);
|
|
if (!od->vchans)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < od->nr_vchans; i++) {
|
|
struct owl_dma_vchan *vchan = &od->vchans[i];
|
|
|
|
vchan->vc.desc_free = owl_dma_desc_free;
|
|
vchan_init(&vchan->vc, &od->dma);
|
|
}
|
|
|
|
/* Create a pool of consistent memory blocks for hardware descriptors */
|
|
od->lli_pool = dma_pool_create(dev_name(od->dma.dev), od->dma.dev,
|
|
sizeof(struct owl_dma_lli),
|
|
__alignof__(struct owl_dma_lli),
|
|
0);
|
|
if (!od->lli_pool) {
|
|
dev_err(&pdev->dev, "unable to allocate DMA descriptor pool\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
clk_prepare_enable(od->clk);
|
|
|
|
ret = dma_async_device_register(&od->dma);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to register DMA engine device\n");
|
|
goto err_pool_free;
|
|
}
|
|
|
|
/* Device-tree DMA controller registration */
|
|
ret = of_dma_controller_register(pdev->dev.of_node,
|
|
owl_dma_of_xlate, od);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "of_dma_controller_register failed\n");
|
|
goto err_dma_unregister;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_dma_unregister:
|
|
dma_async_device_unregister(&od->dma);
|
|
err_pool_free:
|
|
clk_disable_unprepare(od->clk);
|
|
dma_pool_destroy(od->lli_pool);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int owl_dma_remove(struct platform_device *pdev)
|
|
{
|
|
struct owl_dma *od = platform_get_drvdata(pdev);
|
|
|
|
of_dma_controller_free(pdev->dev.of_node);
|
|
dma_async_device_unregister(&od->dma);
|
|
|
|
/* Mask all interrupts for this execution environment */
|
|
dma_writel(od, OWL_DMA_IRQ_EN0, 0x0);
|
|
|
|
/* Make sure we won't have any further interrupts */
|
|
devm_free_irq(od->dma.dev, od->irq, od);
|
|
|
|
owl_dma_free(od);
|
|
|
|
clk_disable_unprepare(od->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id owl_dma_match[] = {
|
|
{ .compatible = "actions,s900-dma", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, owl_dma_match);
|
|
|
|
static struct platform_driver owl_dma_driver = {
|
|
.probe = owl_dma_probe,
|
|
.remove = owl_dma_remove,
|
|
.driver = {
|
|
.name = "dma-owl",
|
|
.of_match_table = of_match_ptr(owl_dma_match),
|
|
},
|
|
};
|
|
|
|
static int owl_dma_init(void)
|
|
{
|
|
return platform_driver_register(&owl_dma_driver);
|
|
}
|
|
subsys_initcall(owl_dma_init);
|
|
|
|
static void __exit owl_dma_exit(void)
|
|
{
|
|
platform_driver_unregister(&owl_dma_driver);
|
|
}
|
|
module_exit(owl_dma_exit);
|
|
|
|
MODULE_AUTHOR("David Liu <liuwei@actions-semi.com>");
|
|
MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
|
|
MODULE_DESCRIPTION("Actions Semi Owl SoCs DMA driver");
|
|
MODULE_LICENSE("GPL");
|